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Mahalanobis-type balance criterion from Morgan & Rubin (2015). $$m = \frac{n_t n_c}{n} (\bar{X}_t - \bar{X}_c)' \Sigma^{-1} (\bar{X}_t - \bar{X}_c)$$

Usage

get_balance(Z, X)

Arguments

Z

Numeric vector. Treatment indicator.

X

Numeric matrix. Covariates.

Value

Numeric scalar. Balance criterion value.